Which Is Not an Explanation Typically Offered for the Knock-And-Announce

Which is not an explanation typically offered for the knock-and-announce rule?

A) The rule protects against individuals mistakenly believing their home is being burglarized and acting in self-defense against the intruders.
B) The occupants of the home are able to prepare for the entry of the police and avoid embarrassment.
C) The police are voluntarily dismissed and are not forced to knock down the door and destroy property.
D) Police are burdened by the requirement to announce their presence before entering the dwelling of another.